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source: trunk/sources/HeuristicLab.SequentialEngine/3.3/SequentialEngine.cs @ 3290

Last change on this file since 3290 was 3290, checked in by swagner, 12 years ago

Implemented reviewers' comments (#893).

File size: 3.1 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using HeuristicLab.Core;
24using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
25
26namespace HeuristicLab.SequentialEngine {
27  /// <summary>
28  /// Represents an engine that executes its steps sequentially, also if they could be executed
29  /// in parallel.
30  /// </summary>
31  [StorableClass]
32  [Item("Sequential Engine", "Engine for sequential execution of algorithms.")]
33  public class SequentialEngine : Engine {
34    private IOperator currentOperator;
35
36    /// <summary>
37    /// Deals with the next operation, if it is an <see cref="AtomicOperation"/> it is executed,
38    /// if it is a <see cref="CompositeOperation"/> its single operations are pushed on the execution stack.
39    /// </summary>
40    /// <remarks>If an error occurs during the execution the operation is aborted and the operation
41    /// is pushed on the stack again.<br/>
42    /// If the execution was successful <see cref="EngineBase.OnOperationExecuted"/> is called.</remarks>
43    protected override void ProcessNextOperation() {
44      currentOperator = null;
45      IOperation next = ExecutionStack.Pop();
46      OperationCollection coll = next as OperationCollection;
47      while (coll != null) {
48        for (int i = coll.Count - 1; i >= 0; i--)
49          ExecutionStack.Push(coll[i]);
50        next = ExecutionStack.Count > 0 ? ExecutionStack.Pop() : null;
51        coll = next as OperationCollection;
52      }
53      IAtomicOperation operation = next as IAtomicOperation;
54      if (operation != null) {
55        try {
56          currentOperator = operation.Operator;
57          ExecutionStack.Push(operation.Operator.Execute((IExecutionContext)operation));
58        }
59        catch (Exception ex) {
60          ExecutionStack.Push(operation);
61          OnExceptionOccurred(ex);
62          Pause();
63        }
64        if (operation.Operator.Breakpoint) {
65          Log.LogMessage(string.Format("Breakpoint: {0}", operation.Operator.Name != string.Empty ? operation.Operator.Name : operation.Operator.ItemName));
66          Pause();
67        }
68      }
69    }
70
71    public override void Pause() {
72      base.Pause();
73      if (currentOperator != null) currentOperator.Abort();
74    }
75    public override void Stop() {
76      base.Stop();
77      if (currentOperator != null) currentOperator.Abort();
78    }
79  }
80}
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